<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>


</head>
<body>
    <div class="outerdiv">
        <div class="interdiv d1">框1</div>
        <div class="interdiv d2">框2</div>
        <div class="interdiv d3">框3</div>


    </div>
</body>
</html>